Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

59 Cards in this Set

  • Front
  • Back
What is unique about Uranus’s rotation?
Spins on its side
Who first purposed the geocentric model of the solar system?
The sun contains what percentage of the solar system’s mass?
List the planets form closest to farthest from the sun.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
Who proposed the heliocentric model of the solar system?
Name the outer planets?
Jupiter, Saturn, Uranus, Neptune, Pluto
Name the inner planets
Mercury, Venus, Earth and Mars
Which planets have one moon?
Earth and Pluto
Which planets have rings?
Saturn, Jupiter, Uranus, Neptune
Copernicus stated what three beliefs of the solar system?
--Earth spins on its axis
--Moon revolves around the earth
Which planets have no moons?
Mercury and Venus
Which planets have two moons?
Pluto is located in which part of the solar system?
Kuiper Belt
Which planets day is longer then its year?
In 1994 what comet slammed into Jupiter?
Shoemaker Levi
Why does Mercury have the widest temperature range?
Very close to sun--during day its facing the sun so it is hot--all night facing away from sun so very cold and atmosphere traps the cold in just as it does with the heat
Explain how the balance between the solar wind and polar gravity affected the order of gas giants?
Harder to push away so it stayed close by--easier ones were pushed away
What are the parts of a comet?
What is the first stage in solar system formation?
Why is the sky black on Mercury?
No atmosphere--doesnt scatter light
Copernicus concluded that the planets revolve aroudn the sun------
retrograde motion
Which is commonly known as a shooting star?
What are teh two main differences between an asteroid and a meteoroid?
Asteroids are bigger and it orbits the sun
Explain why Venus is the hottest planet?
Atmosphere traps the heat
What is the only spacecraft to visit Uranus and Neptune?
Voyager 2
Where do most meteoroids come from?
Melting comets
What is the hottest planet in the solar system?
What planet is named after the god of the underworld?
Which planet was first to be discovered by telescope?
Explain the geocentric model of the universe.
Everything revolves around the earth
Explain the heliocentric model fo the solar system
Everything revolves around the sun
What are the names of Mar's two moons?
Phobos and Dimodes
Give two main differences between inner and outer planets
-Inner planets are rock and outer are gas
-Inner have less moons and outer have more
Why do the years get longer farther away from the sun?
-Longer trip around the sun
-Travel at a slower speed
What two forces keep planets in motion around the sun?
List the three reasons why NASA is so interested in Mars?
-Fossilized bacteria
-Atmosphere is similar to ours
-Polar ice caps and water
What are Kepler's three laws of motion?
-Sun is not in the middle
-Closer the planets are the faster they orbit
-Elliptical orbit
How long does it take earth to rotate once on its axis?
23.56 minutes
Which directoin does the tail of a comet pont and why?
Away from the sun because of the solar wind
What year will Halle's comet next visit earth?
What is the largest known asteroid?
How close is the North Star?
4.24 light years
How was the solar system formed?
-starts as a big ball of gas called a nebula
-gravity contracts the mass
-under so much pressure starts to burn
-once it starts to burn it pushes other materials away
-material cools and forms planet
What is a meteor?
Meteors are rocks in the atmosphere
What is a Meteorite?
A meteorite is a rock that hits a planet
What is a meteoroid?
A Meteoroids is a mass of rock in space
What is the distance from teh sun to the Earth?
150 million km
What is the order of planets largest to smallest?
Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury, Pluto
Which planets have rings?
Jupiter, Saturn, Uranus, Neptune
Which planets have no moons?
Mercury and Venus
Which planets have 1 moon?
Pluto and Earth
Which planets have 2 or more moons?
Mars, Jupiter, Saturn, Uranus, Neptune
Name 3 reasons why Mercury has a lot of craters
-no atmosphere (atmosphere burns up meteors)
-no water to make them erode
-mercury is close to sun
What causes the bands on Jupiter?
High Winds
What are the Spots on Planets?
Where do comets come from?
The Oort Cloud and the Kuiper Belt
What is an asteroid?
A piece of rock similar to but smaller than a planet orbiting the sun.
Where are most asteroids found?
In the Asteroid belt between Mars and Jupiter
What is a comet?
Comets- a mass of rock and dust mixed with frozen water, methane and ammonia (gas) “dirty snowballs”